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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20993eb8e77c1de3993f7198ded0a637d927e7182f08cb5b0384d24be0e9b0a0' 
  AND token = 'oUUU9Y55pqxTJXRA0krjUD+njXS4mO6TY/puIlMBIx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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