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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cf8b1bc5d46d45ef94f2c0490d7c38a120e16537aa713d0ed1ef07c3bc5b963' 
  AND token = '+0E1up7qG1ccHpDqCvQEcaOA254oqrTd9yQQiGLTib4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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