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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '125efe49c74c3260fd5f12a92a852b802791cc081d16b2ac6ea228df89239bf9' 
  AND token = 'iJoVJak3UXkj5g/ldQ2QkzLThOV1aoTLWLaDpQ7JA0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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