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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8bd995ef5d97d902a34062bd930e1c57d5430c3ca027c4996261e267c2d4c53' 
  AND token = 'd9Z2Rt/jtbmcNcEGFHTudYcXEkNFm+sdrqWJnljRsdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}