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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '293604c0aa9acb53329d386e9808a113a6a612f4045cb4e3a0a3e641acd43380' 
  AND token = 'ae6EGA/90sH2Wnge+yjvv3sLSMUAm5BM7gJpS9DFIGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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