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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52c612a03155effc42d3c2a6df4ef913b6ee6f6a31adaca9857f45a9960a0f0e' 
  AND token = '7GNHWqmYcivnFRkxVn+Mczow9AsQWHoPPswvijaeU7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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