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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61954ea93441881e90e5f3ec4140d74247f2e525cf5ae0913127608a461b7a73' 
  AND token = 'D3PCdaISBQw7pRIuv5vkXQGeC0s2CgT79VClU7JInes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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