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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eaaaba276ccd25c639cd185ae4cbac16c8ce883d60e6e6638df5ea73e0622137' 
  AND token = '758vLChG6eE6o2vR5k0VPcS6kF0f74eEDkMJW+ylr4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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