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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cb209232fe34f108dc0c9734133a86ed6cd2f9ea125a955b5ac6ce54da414b8' 
  AND token = 'Fe1/G1IXW/yeocUHmFWIzgsFsYY6Iq4SjLAHjokT9EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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