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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3c6f190e75c8b3cec8049dd1eeafe1a7f4793875eb43797e345c7a0d312ce48' 
  AND token = 'l35+elk5EJRjcinsBCsmyNTPYTKt6hYpMRnAB6G02F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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