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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef27646609d39f839e6d7e0c8eb8ff0adb6304210d9f3ae729b640414ffde7f3' 
  AND token = 'vlxTqkFNXW2OmFpdXeri4mUEr+V+KsNVQ2gC4QSDX0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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