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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e63a3973782f05f4725469f043483951c750abc77def51f2ae4807da14dba896' 
  AND token = 'fUlSL/ynRL9at8D1yv7Co3lRGPrl+kTEZIL68DahWs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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