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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cd5e829097807799165c6bd52724bc885300060fcf5e08b2c2130a4276d16ad' 
  AND token = '2wUoHTkkLZdDS4uEtX7g1Ef9vSu8vlW2tdb4xJkcymM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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