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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3eda8b1fc88809113d733e61cd84c050952b885dcc66a2213ae47dad23dac01e' 
  AND token = '8DYGeuxG58PLLt3jyvufjh1f2Kwc64AJ+jZkLqLloQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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