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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1e1db593c732fb0b61bedeaa607e7da9297a72d204d3170a2540f8fcfc4eeeb7' 
  AND token = 'v/qxuWG0yuzIZkfH60cTax/h3AkucyX2+oVqutyad8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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