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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e930cb0136a0960960bda184ffe2c2e392d44231ce1d170004e57865e919e0c' 
  AND token = '6YBwpQuIwsYI1Y9EowajUZSn/d7hDoo+L5cXDDyTVIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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