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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b171ee922a89f9c5cc4f0c123940ddcfc42c3e7c4ed3112a19b2687567cf1e89' 
  AND token = 'lnVwReKD/ru+GwzrOb8ehONQiz9qseFSDlDB4N/NNwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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