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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae13fe5f3e45c99d001bbcb01ebacb518c6f8e87389cea86a4411e9e19f26bb4' 
  AND token = 'y60WVRYmuIt/VnQ46GupQVnidQsgOvTT7wz+3OCp788=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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