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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcb14723bed7067c493dc6abf2b953ae8954d7c67416f8a181f007be1e81c463' 
  AND token = 'Mxe03+DoAYPpcRYqWDI+UX2cXxgA+24rmmbCZPV8TsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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