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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be36653c25149d7decaaa3293dfc4df6428f5f38db4bf5dd8af4ebf14c3a44c0' 
  AND token = 'P5So+nlVcF0JXsZGytNXxjFWQiAfwhsPNeX1ciI6Z/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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