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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e910380b6b1376c6d05c1369ce347eeb517094cd3cb52f23db3167d233a6596b' 
  AND token = 'REPQ0iKS4LDKEdfdvf4imJvvt+QOh7zNUurzk3WXp/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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