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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb38bedf5ebbc1fde42ef345c3fc109829a0438581524de020cd40fa7c1a5119' 
  AND token = '9I0BheC3OxTpp/hx2djP2QyTuB7CYZmRPUc0CrYBRPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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