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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e31df547ba741012625b132b121a5bb429c24536922ea6e085305e30eb65f05d' 
  AND token = '9fsMPDi6bcSoStaKvYsgZdKN4PSLqH7HfZmZXX/+k5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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