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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63d6e3498305d4f006d4c7e1f66cc0b38a75e59e90c7f5c583a02f8b5a27bc0c' 
  AND token = '5MKm0sJ9yWLZhw3XkPuBBqet1uKTRTiL3295L2wBOl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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