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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cd3a430e7ad565f50866d03f39e2fdccbc12a9e182d950eb96836babaf947fb' 
  AND token = '/X4bC2u7rQMsV5wDwnSLg9lM1/QWjlnkuDd0XcfiNzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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