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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5da5a4ff3a84564942846841f7e1ecad620d04d7c1701636b670d620b39c139' 
  AND token = 'fm7hOc5rnogh/Obw7gDv2+zV5klu6A5VRheepuV3cmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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