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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73d090314380b2def9b43af147ca5c926d648ea8fb7ad66a0093a254a9b0e7fa' 
  AND token = 'llqIvJr99PJwq6zEe6c7zqNsQ9xkUlinezd8l5rcxzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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