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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f7e3444c7e12c3a259071c651a0f825473af59ed91917e74252b5e61ffad2a5' 
  AND token = '/0tRNRC/s7cwAAT4h/P61ilHRP4795J/ONXG9Umme/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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