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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19c61358a80da80368f8022a3be200c46aba4e146c7bcc3d677cf47aecd7abe7' 
  AND token = 'ly6uI7uP49y41d1irvJyosVisS2JMF8HamsAFdgTVhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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