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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaffe28a85c570cfcad3a0bc5847abff0b90f9cc903f279d7f23b3816e897f9b' 
  AND token = 's5LC6/myb7DJ2ph0TG08guRTNQVUYZIP3jEo4LUWE20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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