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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d98cfc697abf8063b0440a3906b761cb39cf7b0beacbcf4a0691db426eb67bf' 
  AND token = '7Uzur0/QCy604HS8pfNmd8MLR6bEi8KNdA5G8SZ/RNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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