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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '201daa38c83637958d8ba0fd8dd7ddced517b0268a1a81f8a9b79fff51129f80' 
  AND token = 'r8JBn3dF98tYc0iMscn9L+7x4Uw/Qum5kEDjIK5OvCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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