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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '62513fbf7da94d0e4d5e078a972bb14a0a5482a96e95248c5903e9c589f13efe' 
  AND token = 'y/gWYDoSCjNAX+8xXfJDfRwOEIPWRa+yIo4r9zMxlO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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